Kenneth W. Regan D. Sivakumar Jin-yi Cai Pseudorandom Generators, Measure Theory, and Natural Proofs Electronic Colloquium on Computational Complexity (ECCC) 1995 6 2 db/journals/eccc/eccc2.html#ECCC-TR95-006 http://eccc.hpi-web.de/eccc-reports/1995/TR95-006/index.html